The 33-year-old British actress made her first red carpet appearance since giving birth to her second daughter, Violet, in June, at The Hollars premiere in New York City on Thursday. Blunt was supporting her husband, John Krasinski -- who directed and stars in the film -- but stole the show in a perfectly fitted white David Koma dress.

ET spoke to Krasinski at the premiere, and even he couldn't help but gush over his wife's stunning appearance.

"I have no idea," the 36-year-old actor marveled when asked how Blunt looks so incredible just two months after giving birth. "And it's just frustrating because even I have to work way too hard to look even like this, and she just does it by waking up."

Thursday was a fun night out for the two sans their kids, including their eldest, 2-year-old Hazel.

"It is a date night -- we try to do one date night a week at least and, you know, this isn't a bad one," Krasinski said.

The former Office star also dished to ET about Violet and Hazel's already close relationship.

"[Hazel] really loves the baby and I think there is this idea of, 'Oh my God, she is adorable,'" he shared. "I mean when a 2-and-a-half-year-old hugs a newborn baby it's one of the cutest things you will ever see."